Subject(s): Ideology -- Communism -- Democratic socialism -- Right and left (Political science) -- Political science -- Political ideologies history -- Nationalism -- Karl Marx -- Feudalism to capitalism -- Russian communism, Chines communism -- Development of democratic socialism -- Modern democratic socialism -- Liberalism -- Liberal tradition -- Modern liberalism in US -- Conservatism -- Classic and modern conservatism -- Contemporary trends in American conservatism -- Authoritarianism -- Totalitarianism -- Typologies of authoritarian political systems -- Fascism and national socialism -- Italian fascism -- German national socialism